Recently we faced an issue that while updating the quantity of the “saved for later items” items in website,getting an error message in the items of cart as below.
So, Understood that this field has values greater than its maximum number allowed. Inspected the console and checked the network tab and checked payload. So understood that this field summarizes the value from some transaction line items.
So checked the transaction line item and verified that some of them are not using in the development ,so made the ‘store item’ checkbox as unchecked for the mentioned transaction line items..
After unchecking the unnecessary transaction line field, the issue solved.